This specification covers a primer coating in white and tints for exterior woodwork and siding with volatile organic compound content of 250 grams per liter (2.08 lb. gal) maximum. This specification is canceled. Superseded by A-A-2336.

Steel, Non-Ferrous Metals & Galvanizing. Surface to be coated must be clean, dry, and free of all foreign contaminants including grease, oil, dirt and paint. Clean in accordance with SSPC-SP-1. Most metals should be sanded, except aluminum, which must have a base coat of pre- treatment wash primer MIL-C-8514C, followed by one wet coat of TT-P-645B. Alloys that oxidize must be lightly sanded to remove all loose material. Dirt and dust are best removed with a stiff bristle brush and by compressed air. For exterior use and non-ferrous metals, it is recommended that TT-P-645B be applied over pre-treatment coating conforming to MIL-C-8514C or DOD-P-15328D. Grease and oil should be removed by cleaning with appropriate solvents such as mineral spirits, lacquer wash thinner or xylene.

Mixing/Application:

Apply by spray, or brush/roll small areas to deposit a hiding coat of primer. A wet coat is necessary to secure maximum adhesion and corrosion inhibiting properties. For application by spray, thin sparingly with Xylene per TT-X-916 or MIL-T-81772B TY.III only as need for proper atomization. For brush or roller, use at packaged viscosity.